From: email@example.com (Ed Hahn) Organization: The MITRE Corporation, McLean, Va. Date: 27 Apr 95 03:00:25 References: 1 2
View raw article or MIME structure
> In article <airliners.1995.437@ohare.Chicago.COM> "Steven J. Leighton" <firstname.lastname@example.org> writes: <snip> >I have been led to believe that for the final 200 feet before >touchdown Boeing aircraft use the INS system for landing as opposed >to ILS alone. Could someone please clarify if this is truly the case. One detail that people seem to forget is that the Inertial Reference System (IRS) provides _attitude_ information, and thus is an integral part of any flight maneuver, ILS landings included. In this application, the position/speed information is a backup for radio navigation. (Although if the ILS signals were lost, the aircraft could not continue the approach unless the runway was in sight.) (BTW - FMS equipped aircraft have an IRS, not an INS. The FMS performs the navigation function, while the IRUs provide position/velocity/attitude information. Older aircraft without FMCs have the navigation function integrated with the position/velocity/attitude function, hence INS.) Nickpicky, I know... ed -------- Ed Hahn | email@example.com | (703) 883-5988 -------- The above comment reflects the opinions of the author, and does not constitute endorsement or implied warranty by the MITRE Corporation. Really, I wouldn't kid you about a thing like this.